Engine



FIG. 1 is a perspective view of an engine;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The portions of the engine shown in broken lines are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM We claim the ornamental design for an engine, as shown and described. 